$secret = 'ZzsMLGKe162CfA5EcG6j';

$my_address = '{YOUR BITCOIN ADDRESS}';

$my_callback_url = 'https://mystore.com?invoice_id=058921123&secret='.$secret;

$root_url = 'https://blockchain.info/api/receive';

$parameters = 'method=create&address=' . $my_address .'&callback='. urlencode($my_callback_url);

$response = file_get_contents($root_url . '?' . $parameters);

$object = json_decode($response);

echo 'Send Payment To : ' . $object->input_address;

https://blockchain.info/api/receive?method=create&address=$receiving_address&callback=$callback_url

$receiving_address Your Receiving Bitcoin Address (Where you would like the payment to be sent)
$callback_url The callback URL to be notified when a payment is received. Remember to URL Encode the callback url when calling the create method.
RESPONSE: 200 OK, APPLICATION/JSON

{
    "fee_percent":0,
    "destination":"1A8JiWcwvpY7tAopUkSnGuEYHmzGYfZPiq",
    "input_address":"1KZoUuPWFAeyVySHAGqvTUDoX6P3ntuLNF",
    "callback_url":"http://yoururl.com"
}